Process of producing size for paper.



COATING R PLASTIC.

' and consists of fine white paper having a very UNITED STATES ileferenPATENT OFFICE.

success 0F PRODUC ING SIZE FOR PAPER.

SPECIFICATION forming part Of Letters Patent N 0. 686,374, datedNovember 12, 1901.

Application filed January 28, 1901.

To all whom it may concern.-

Be it known that I, JULIUS WEZEL, a subject of the King of Saxony,residing at Leipsic, Saxony, Germany, have invented a certain new andusefullmproved Process for Producing Size for Paper, of which thefollowing is a description.

The present invention relates to the production of a substitute foranimal size, and especially that class of size used in the man ufactureof the finer class of paper generally employed for colored printing.This paper is known in commerce as chromo-paper,

thin coating of size and a slight coating of blanc fixe with size. Inproducing this paper a mineral layer, consisting of the so-called blancfixe and kaolin gchina-clay) is required, such layer aving hitherto beenfixed by animal size. Latterly instead of animal size a mixture of thesame with vegetable sizei. 6., a preparation consisting ofpotatostarchandalkalies-wasemployed Bymeans of vegetable size a fixingof the mineral layer can only be attained when comparatively largequantities of-the same are employed. In this case disadvantages arise inthat, first, too little opaque pigment is precipitated on the paper,thus failing to attain a pure white color, and, secondly, that owing tothe decreased porosity the reception of the color on printing isrendered difficult or wholly prevented. The employment of animal sizeis, however, very expensive, not only on account of the high marketprice of the same, but also for the reason that this size has to beproduced in considerable quantities and during the hot season istherefor liable to get bad and foul. According to the present inventionthese disadvantages are prevented, owing to the fact that largerquantities of opaque pigment may be fixed on the paper to be providedwith the layer with only small quantities of the im- Serial No. 45,171.(No specimens.)

M I 7 proved size, and at the same time the porosityis entirelypreserved. The improved size valone or mixed with the opaque pigment isnot liable to turn bad or foul.

The size is deed in the following manner: A cerafm Solution is firstproduced by di. h rn-shavingsin asuit-ablelve. It h 1 that at leastthree parts, by o. urn-shavings will be dissolved by a lye formed bydissolving two parts,by weight,

Wrepeated stirring, and the result is diluted by an addition of water toa consistency of 7.5 Baum. At t e same time a solution of water-"lass isdiluted by water to 7. 5 Baumc. mfi'kflograms of each of these solutionsare added to forty kilograms of otato-starch, which has been mixed withth 221m tity of water and stirred up to a paste. The whole mixture iscontinuously stirred until an even, smooth, and 'iscous due is formed,to which finally acetic acid is added until thesaidglueshowsmlinereaction. Instead of the soda-l e a ot'issium-l e maybe used as means or disso ving e 1orn-shavings, or a mixture of bothlyes may be employed. In the same manner the acetic acid may be replacedby mineral K in a comparative y 1 u e s a e.

\Vitnesses:

CHAS. J. BURT, RUDOLPH FRICKE.

